Choke device for attachment to a shotgun



Nov. 25, 1958 D. s. RODICK 2,361,375

CHOKE DEVICE FOR ATTACHMENT TO A sno'rcun Filed Dec. 30, 1955 2 Sheets-Sheet 1 IN V EN TOR.

hOuGl-As 26 O C K Nov. 25, 1958 D. s. RODICK 2,861,375

. CHOKE DEVICE FOR ATTACHMENT TO A SHOTGUN Filed Dec. 50, 1955 2s 7 lo .26 27 I INVENTOR. v 'DQQGLAS S- EcomzK I BY 7 ATTOZN EZYS 2 Sheets-Sheet 2 the latter.

ted States Patent CHOKE DEVICE FOR ATTACHMENT TO A,

. SHOTGUN.

Douglas S. Rodick, South Portland, Maine Application December 30,1955, Serial No. 556,658, 2 Claims. (C1,- 42-79 The present invention relates to shotguns, andin particular'to'a choke device forattachmentto-a shot-gun barrel.

An object of the present invention is to provide -a-choke device for attachment toa-shotgun which permits a-shot to be fired unchoked and asecond'shot-to be fired-which is-choked, so that-the spread-and pattern of the. shot pellets ofthe second shot will-bevirtually the same at a long range; as the spread andpatternof the-shot pellets oft he first; shot at a short range, permitting more-hits on .tar getswhich-move awayfrom' theuser of the shotgun. 'Another object of the present inventionis to provide a choke device for attachnientto ashotgun'barrel which automatically moves from-the normal or- No-Choke positionto a Full-Choke position upon firing-of the present invention,--showing it installed upon ashotgun barrel; thelatter-bein-g partially broken-away,

Figure 2 is an exploded perspective view of the assembly of Figure 1,

Figure 3 is.a sectional view, on an enlarged scale, taken on the line 33 of Figure 1, the arrows showing the direction of the flow of gases,

Figure 4 is a sectional view taken on the line 44 of Figure 3 showing the choke device of the present invention in unchoked position,

Figure 5 is a sectional view similar to Figure 4, but showing the choke device in a choked position,

Figure 6 is a sectional view taken on the line 66 of Figure 3, and

Figure 7 is a sectional view taken on the line 7-7 of Figure 3.

Referring in greater detail to the drawings in which like numerals indicate like parts throughout the several views, the choke device of the present invention comprises a sleeve 10 fabricated of a semirigid metal and having a portion 11 adjacent one end embracingly secured to the portion of a shotgun barrel 12 adjacent the free end of The sleeve 10 has a plurality of slots 13 extending fro-m the other end to a point adjacent the portion 11 and forming a plurality of longitudinally-extending fingers 14. p

A second sleeve 15 is arranged so that one portion 16 adjacent one end thereof slidably receives and embraces e 2,861,375 Patented Nov. 25, 1958 sleeve-10- formovement from the position in which the end p0rtionf16 embraces the fingers 14;to the position in which the sleeve other end portion surrounds the fingers 14. Specifically, this means embodies a slot 18 on each side of the sleeve 15 extending from the end which receives and-embraces the fingers 14 to a point adjacent the other end portion of the sleeve 15. A pin 19 projects from each side of the sleeve 10 adjacent the end of the latter which is secured to the gun barrel 12. The pins 19 are received in the slots l8 and serve as guides when the sleeve 15 is moved from the position in which the portion 16 embraces the fingers 14 to a position in which the other endportion of the sleeve 15 surrounds the fingers 14.

The inner wall of the other end portion of the sleeve 15 is provided with four ridges 20, one for each finger 14. Each of the ridges 20 tapers in height to form a cam face 21 which engages the outer surface of the adjacent one of the fingers 14; The ridges 2i) compress the fingers .14 toward each other upon execution of movement of the sleeve 15 from the position in which the end portion 16 receives and embraces the fingers 14 to the position in which the other end portion of the sleeve 15 surrounds the fingers 1410 effect a choking action.

Means is providedon the other end portion of the sleeve 15 for efiecting the movement of the sleeve 15.

"Specifically, this means embodies an obliquely-disposed fin sleeve '15 relative'to the sleey'e 10.' Theisleeve 15 is grooves 23 cut transversely or the' fingers 14.

manually movable to" the unchoked'posit-iori. p "The fingers 3 14 are'ea'ch provided with semicircular grooves '23 are equidistant' from each other-and of co1i stantlydimi-nishing .deptlr-and width, the deepest being adjacentthe portion llrj This provides magirnurn'fiexi- -bility with"'the le ast-saerilice of strength and permits the uniforminwardl bending' of the fingers 14 without break- A=sho'ulder-24 is provided inwardly ofand spaced fro'm the longitudinally-extending fingers 14. The portion of the sleeve 15 adjacent the other end is provided with a plurality of transversely-disposed ports 17 arranged in longitudinally spaced relation therealong.

Means is provided for connecting the sleeve 15 to the front face. A fiat portion on the upper part of the shoulder 24 has mounted on it a front gun sight 26. The part of the sleeve 15 between the shoulder 24 and the adjacent end of the sleeve 15 is threaded as at 27 and recevies a knurled nut 28 when the choke device of the present invention is assembled on the gun barrel 12.

The shoulder 24 has another flat portion 29 diametrically opposite the portion 25 in which is a small bore containing a ball 30 and a spring 31, constituting a springbiased detent. A second ball 32 and a spring 33, con stituting another spring-biased detent, are mounted in another bore in the portion 16 of the sleeve 15 inwardly of the'other end of the portion 16. A semicircular recess 34 provided in the outer wall of the portion 11 of the sleeve 10 receives the ball 32 when the sleeve 15 is in its rearward position and receives the ball 30 when the sleeve 15 is in its forward position. Each of the bores containing the spring detents is closed by suitable means such as caps 35 and 36. The part of the sleeve 15 having the ports 17 is reinforced by ribs 38, each formed integrally with one of the ridges 20.

In the assembly of the choke device of the present invention, the sleeve 10 is first positioned with the portion 11 on the end of the gun barrel 12. It is welded there or otherwise secured. The nut 28 is then slipped over the fingers 14 and over the sleeve 10 and on to the gun barrel 12, there being provided slots 37 which permit the nut 28 to pass over the pins 19. The sleeve 15 is then assembled so that it embraces the sleeve 10 and the nut 28 is turned upon the threaded portion of the sleeve 15 Theand turned to such a position that the slots 37 are at right angles to the pins 19, this position being shown in Figure 2.

In use, the sleeve 15 is left in its forward position with the spring detent ball 30 received in the recess 34. Upon firing of the first shot the gases emerging from the gun barrel 12 propel the shot pellets through the sleeves and 1S and as the pellets reach the part of the sleeve 15 adjacent the highest point of the ridges the flow of gases is constrained, resulting in the portion of the gases behind and adjacent the highest point of the ridges to be ejected out of the port 17 and against the under faces of the fins 22 to propel the sleeve 15 rearwardly upon the sleeve 10 from the forward position in Figure 4 to the rearward position in Figure 5. The second shot will then be choked by the constriction of the fingers 14. This permits the user of the shotgun to have a normal choked shot at the target for his first shot and a full choked shot for his second shot.

'What is claimed is:

1. The combination with a shotgun barrel having a free end, of a choke device operatively connected to said shotgun barreL said device comprising a sleeve having a portion adjacent one end thereof embracingly secured to the portion of said shotgun barrel adjacent the free end of the latter, said sleeve having a plurality of slots extending from the other end to a point adjacent said portion and forming a plurality of longitudinally-extending fingers, a second sleeve having the portion adjacent one end slidably receiving and embracing said longitudinally-extending fingers, said second sleeve having in the portion adjacent the other end thereof a plurality of transversely-disposed ports arranged in longitudinal spaced relation therealong, means connecting said second sleeve to said first-named sleeve for movement from the position in which said second sleeve one end portion embraces said fingers to a position in which said second sleeve other end portion surrounds said fingers, a plurality of longitudinally-extending ridges on the inner face of said second sleeve other end portion and engageable with said fingers upon execution of movement of said second sleeve from the position in which said second sleeve one end portion embraces said fingers to a position in which said second sleeve other end portion sur- 4 rounds said fingers to thereby compress said fingers toward each other and effect a choking action, and a propelling surface adjacent each port and operable by the fiow of gases from said port to effect the movement of said second sleeve relative to said first sleeve.

2. The combination with a shotgun barrel having a free end, of a choke device operatively connected to said shotgun barrel, said device comprising a sleeve having a portion adjacent one end thereof embracingly secured to the portion of said shotgun barrel adjacent the free end of the latter, said sleeve having a plurality of slots extending from the other end to a point adjacent said portion and forming a plurality of longitudinally-extending fingers, a second sleeve' having the portion adjacent one end slidably receiving and embracing said longitudinally-extending fingers, said second sleeve having in the portion adjacent the other end thereof a plurality of transversely-disposed ports arranged in longitudinal spaced relation therealong, means connecting said second sleeve to said first-named sleeve for movement from the position in which said second sleeve one end portion embraces said fingers to a position in which said second sleeve other end portion surrounds said fingers, a plurality of longitudinally-extending ridges on the inner face of said second sleeve other end portion and engageable with said fingers upon execution of movement of said second sleeve from the position in which said second sleeve one end portion embraces said fingers to a position in Which'said second sleeve other end portion surrounds said fingers to thereby compress said fingers toward each other and efiect a choking action, and a propelling surface adjacent each port and operable by the flow of gases from said port to eflect the movement of said second sleeve relative to said first sleeve, said propelling surface embodying an obliquely-disposed fin positioned adjacent each port and carried by said second sleeve other end portion.

References Cited in the file of this patent UNITED STATES PATENTS 7 2,417,721 Whedon Mar. 18, 1947 2,676,429, Gotterson Apr. 27, 1954 2,759,286 Moore Aug. 21,- 1956 

